The Celestron Dew Heater Ring is the ideal dew prevention solution for your Celestron telescope. This must-have accessory will improve your observing or imaging nights year-round. The Dew Heater Ring is custom fit for your 5" Celestron Schmidt-Cassegrain optical tube and permanently replaces your retaining ring to provide efficient heating across the plate. Once it's installed, you'll never be caught without it. The process is quick and easy. The ring is constructed of lightweight, durable aluminum. Its rigid frame supports the cable circuity and the telescope's Schmidt corrector lens. Plug the ring into an external 12V DC power source for consistent, continuous heat that will prevent dew from forming. The Dew Heater Ring features two storage clips to keep the power and thermistor jacks secure while accommodating the telescope's dust cover. The Dew Heater Ring also comes with a cable management clip that connects to the telescope's front cell, providing a convenient location to corral essential cables so they aren't left dangling, adding unnecessary weight to your corrector.